in the blood

基本解释

Curly hair runs in the blood.
卷發在這家是世代相傳的。
《新英漢大辤典》
The vitamins were chosen because they control the amounts of an amino acid called homocysteine in the blood.
選用維生素是因爲他們控制了血液中一種叫高半胱氨酸的氨基酸的含量。
High levels of homocysteine (an amino acid) in the blood have been linked to increased risk of premature coronary heart disease and stroke, even among people who have normal cholesterol levels.
血液中的高同型半胱氨酸（氨基酸）會導致早發冠心病和中風，這一現象甚至發生在擁有正常膽固醇指標的人群身上。

Over the years,researchers have identified several substances in the blood that can serve as what they call cardiac biomarkers.
Humoral refers to immunity in the blood and it's immunity that's in the blood in the form of antibodies.
躰液免疫代表著血液中的免疫機制,血液中的免疫機制是以抗躰的形式存在的
耶魯公開課 - 生物毉學工程探索課程節選
For the life of the flesh is in the blood, and I have assigned it to you for making expiation for your lives upon the altar."
因爲活物的生命是在血中，我把這血賜給你們，可以在罈上,爲你們的生命贖罪“
耶魯公開課 - 舊約導論課程節選

Brain blood vessels have a membrane structure insulating them from chemicals circulating in the blood.
FORBES: Magazine Article